Priestly Blessing for a Mourner during the Seven Days on Chol HaMoed

A Kohen in mourning whose father passed away during Chol HaMoed Sukkot, is he allowed to perform the Priestly Blessing?

The Shulchan Aruch, Orach Chaim, Siman 128, Seif 43 states: "After the seven days of mourning, he raises his hands; and during the seven days of mourning, he leaves the synagogue when the Kohanim are called." The Mishnah Berurah there, Seif Katan 157, writes: "By law, the mourner is obligated to bless, for he is obligated in all the commandments of the Torah, but it is customary not to raise hands because the Kohen must be in joy and good heart during the blessing, as it is written 'and he will bless with joy', therefore he must leave so that he is not called to ascend, and even on Shabbat, if there is no other Kohen, he does not ascend. But if he did not leave and was called to ascend, whether on Shabbat or weekday, if there is no other Kohen or there are other Kohanim, he must ascend, otherwise he transgresses a positive commandment." This law also applies on Yom Tov, as written in Olat Tamid, Siman 128, Seif Katan 90: "The reason is that one must be in joy, and during the seven days all kinds of joy are forbidden, and on Shabbat and Yom Tov during the seven days he also does not raise his hands." Also written in Eliyah Rabbah, Siman 128: "There was a case with a Kohen who buried his deceased on the festival, and my master father, Rav Ner"u, ruled that since private matters are observed, it is like a mourner after Shabbat and Yom Tov, and he leaves the synagogue." Also written in Shulchan Aruch HaRav and Magen Giborim, and Aruch HaShulchan, Siman 128, Seif 158. The custom of some residents of Jerusalem is that the mourner blesses the Priestly Blessing even during the seven days, as written in Kaf HaChaim, Siman 128, Seif 253, and also in Radbaz, Part 2.